Warning: [mysql error 145] Table './piwigo/piwigo_user_feed' is marked as crashed and should be repaired

SELECT COUNT(*)
  FROM piwigo_user_feed
  WHERE id = 'JTFaufgW7W7Iwphk7KBGJH9e0JeqUaVqj5CWUhqKX3orLqzNik'
; in /home/piwigo/public_html/piwigo-2.6.4/piwigo/include/dblayer/functions_mysqli.inc.php on line 798